Karena Walter, The Standard

Rainbow Hill testified Tuesday that she and her lover, Roseanne Whalen -- Marissa’s mom -- were in the middle of yet another argument when she decided to give two-year-old Marissa a bath. She carried the toddler to the bathroom and reached out to turn on the water.

"I dropped Marissa face-down into the bathtub," Hill told court as Whalen, on trial for second-degree murder, wept from the prisoner’s box.

"When I went to pick her up, her eyes were rolling into the back of her head."

It was July 29, 2011, two days after Marissa's second birthday. Hill said she carried the dead or dying girl out of the bathroom. "She was limp," Hill said.

"I believe she was unconscious."

The couple had a problem. The girl, Hill testified, was "black and blue" from daily abuse. The police couldn't be allowed to see that.